Is that intended?
I was making a drug that had 2 positive effects in it. I produced 15 per month of that drug. On the cures screen it showed 15 treated persons per month on both effects (so 30 total) and reduced the demand for both cures.
From a gameplay perspective that might be ok, but the problem is that it implies that all the treated patients had both afflictions at the same time. I think that is improbable…
It might be more logical to distribute the number of treatments in some way. (evenly, by effect strength, by demand …)